We have developed and manufactured a product based round the LPC8N04. The latest production batch fails to function, but do operate in debug. The processors on this batch appear to have a date code 832. There are no mention of changes on the official NXP LPC8N04 web site, but we have found a note on the Mouser website stating there has been a Boot ROM change from date code 824 to version 0.14.
We have developed the application in MCUXpresso v10.2.1. Please explicitly explain how to incorporate any changes required to the application code or MCUXpresso environment to cater for your change in Boot ROM.